CN113220246B - Color purity enhancement method for output data of multi-ink-channel printer - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1208—Improving or facilitating administration, e.g. print management resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1242—Image or content composition onto a page
Abstract
The application relates to a color purity enhancement method of output data of a multi-ink-channel printer, which comprises the steps of traversing an output image of the multi-ink-channel printer according to pixels, globally analyzing each ink channel with a smaller ink amount, selecting a threshold parameter by combining an ink amount clearing threshold, an attenuation radius and a clearing mode, directly clearing the ink with a particularly small amount, determining the clearing amount of the ink with a probability clearing and proportion clearing mixed algorithm according to the smaller ink amount, and converting the clearing amount to an appropriate channel according to a pixel constant brightness rule and a gray component replacement rule, so that the influence of the data of the small ink amount channel on a printing output result is eliminated or reduced as much as possible, and the purposes of enhancing the visual purity of the output result of the multi-ink-channel printer and keeping the original gradient image smooth transition are achieved.
Description
Technical Field
The application relates to a color purity enhancement method of output data of a multi-ink-channel printer, which is mainly suitable for digital printing.
Background
Color purity is visually expressed as the vividness of the color, also known as saturation. The color with high color purity contains 1-2 color channels with large ink amount in the color channels, and the ink amount of the rest channels is small, and the color purity of the color is higher when the ratio of the ink amount of the small ink amount channel to the ink amount of the large ink amount channel is larger.
When an RGB image is sent to a printer, color separation is performed according to ink channels of the printer device, that is, an RGB color space of the image is decomposed into a device space of CM YK + N channels of the printer according to a similar chromaticity conversion principle, where N is the number of spot color channels, for example, CMYKBORG indicates 4 CMYK channels plus 4B (blue), O (orange), R (red), and G (green) spot color channels. In the color separation process, some high-purity colors are converted into device color data containing small ink quantity channels, and the existence of the small ink quantity channel data influences the visual purity of the output result of the printer.
Therefore, eliminating or reducing the influence of these small ink volume channel data within the error tolerance range can enhance the visual purity of the printer output result to some extent.
Disclosure of Invention
The technical problem solved by the application is to provide a full map for printing an output image by traversing a multi-ink-channel printer, and apply an optimal ink quantity clearing rule to all pixels of the full map to calculate the optimal ink quantity of the pixel point, so that the visual purity of an output result of the multi-ink-channel printer is enhanced.
The technical scheme adopted by the application for solving the technical problems is as follows: a color purity enhancement method of output data of a multi-ink-channel printer, a color space of the multi-ink-channel printer including CMYK, the color purity enhancement method comprising the steps of:
s1 defines a multi-ink channel printer ink quantity clearing threshold T, an attenuation radius R, a clearing mode selection threshold PT and an attenuation function, and a processing pointer points to an initial processing position of an image to be printed and output;
s2 finding the maximum ink channel and ink amount in the pixel;
s3 calculating the ratio X of ink amount in other ink channels in the pixeliWherein the subscript i refers to the number of ink channels in the pixel, X, other than the largest ink channeliThe ink amount D of the i ink channel in the pixeliThe ratio of the ink volume to the maximum ink channel in the pixel;
s4 if XiNot greater than the ink amount clear threshold:
s41 directly clearing the ink amount of the i ink channel in the pixel;
s42, adding the cleaning amount to the maximum ink channel according to the ratio of the blackness of the i-number ink channel to the blackness of the maximum ink channel, and if the cleaning is performed by the K-number ink channel, equally distributing the cleaning amount to the C, M, Y channel;
note: and (3) a pixel constant brightness rule, namely calculating the removal amount according to the blackness relation between the maximum ink channel and the removed ink channel, and adding the calculated amount to the ink amount of the maximum ink channel to obtain the actual ink amount so as to keep the brightness of the processed pixel unchanged. The algorithm is described as: the maximum blackness value of each ink channel is calculated in advance, the blackness value is 100-the lab.l value of the ink of the channel, and the ink amount of the i-type ink channel added on the maximum ink channel is the cleaning amount of the i-type ink channel multiplied by the blackness of the i-type ink channel/the maximum ink channel.
S5 if the ink amount clear threshold is < XiIf the ink quantity clearing threshold value is less than the attenuation radius, carrying out mixed treatment of probability clearing and proportion clearing;
s51 is according to XiAt a position within the attenuation radius, the clearance factor P (X) is obtained by the attenuation functioni)，P(Xi) E (0,1), calculating a first probability value e (0,1) by using a probability generator, if the first probability value is less than or equal to a clearing mode selection threshold value, executing a probability clearing process, or else executing a proportion clearing process;
s52, the clearing quantity is distributed and added to the maximum ink channel according to the proportion of the black degree of the ink channel I to the black degree of the maximum ink channel, if the ink channel is cleared by the ink channel K, the clearing quantity is distributed to the channel C, M, Y in an equivalent way;
s6 if the pixel has other unprocessed ink channels except the maximum ink channel, turning to the step S3 after the processing pointer points to the next unprocessed ink channel of the pixel, and processing the next unprocessed ink channel of the pixel until all the ink channels of the pixel are processed;
s7 if the multi-ink-channel printer has unprocessed pixels, the process pointer is pointed to next pixel and then the process goes to S2 to process the next pixel until all pixels are processed.
The probability clearing process comprises the following steps: removing coefficient P (X)i) As a direct erasure probability, a second probability value e [0,1 ] is calculated by a probability generator, if the second probability value is less than or equal to P (X)i) The ink amount of the channel i is completely removed; if the second probability value is greater than P (X)i) The i channel ink volume is not cleared.
The proportional cleaning process comprises the following steps: removing coefficient P (X)i) As the removal rate, the amount of ink removed in channel i is Di×P(Xi)。
The application selects the clearing mode not less than 0The threshold is less than or equal to 1, can be selected according to the image situation, and the attenuation function y is equal to cxq+d，q>1，0＜y＜1。
For the image with the color block as the main part, R takes a small value, such as R < T/a, a belongs to [2,4 ]; for images that fade into the main, R takes a large value, e.g., R ═ T × b, b ∈ [1,5 ].
The ink volume removal threshold T is 2.2%, the attenuation radius R is 6.6%, the removal mode selection threshold is 0.3, and the attenuation function is 1- (X) with yi-2.2)2.1/6.62.1。
The application has the beneficial effects that: by traversing the image according to pixels, globally analyzing each ink channel with smaller ink volume, selecting threshold parameters by combining an ink volume clearing threshold, an attenuation radius and a clearing mode, selecting an optimal ink volume clearing rule, and converting the clearing volume to a proper channel according to a pixel constant brightness rule and a gray component replacement rule, the influence of the data of the small ink volume channels on a printing output result is eliminated or reduced as much as possible, and the purposes of enhancing the visual purity of the output result of the multi-ink-channel printer and keeping the transition smoothness of the original gradient image are achieved.
Drawings
Fig. 1 is a flowchart of an algorithm according to an embodiment of the present application.
Fig. 2 shows an ink amount clearing rule according to an embodiment of the present application.
Fig. 3 is a cleaning example 1 of the present application.
Fig. 4 is a cleaning example 2 of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of examples, which are illustrative of the present application and are not limited to the following examples.
The application provides a method for printing a full image of an output image by traversing a multi-ink-channel (i.e. multi-color) printer, wherein the full image is calculated by applying an optimal ink quantity clearing rule to all pixels of the full image to obtain the optimal ink quantity of the pixel point, and then the optimal ink quantity of all the pixel points calculated by applying the optimal ink quantity clearing rule is printed by using the multi-ink-channel printer, so that the visual purity of the final printed image is enhanced. The color space of the multi-ink-channel printer comprises CMYK, and can be expressed as CMYK + N, wherein N is usually 0-12, and represents the number of other colors except CMYK.
The technical scheme adopted by the application for solving the technical problems comprises the following steps:
s1 defines a multi-ink channel printer ink quantity clearing threshold T, an attenuation radius R, a clearing mode selection threshold PT and an attenuation function, a processing pointer points to an initial processing position of an image to be printed and output (the processing position is carried out in sequence according to the distribution of the image, the same pixel is carried out in sequence according to the channel, and the initial processing position refers to the channel No. 1 of the first pixel);
s2 finds a pixel (a pixel point processed this time, i.e., the position pointed by the processing pointer) in the image to be printed and output by the multi-ink-channel printer, and finds the largest ink channel and the amount Dmax thereof in the pixel (if the processing pointer points to the increased ink amount channel, the processing pointer points to the next channel);
s3 calculating the ratio X of ink amount in other ink channels in the pixeliWherein the subscript i refers to the number of ink channels in the pixel, X, other than the largest ink channeliThe ink amount D of the i ink channel in the pixeliA ratio to an ink amount Dmax of a maximum ink channel in the pixel;
s4 if XiNot greater than the ink amount clear threshold T:
s41 directly clearing ink amount D of i ink channel in the pixeli；
S42 obeys the pixel constant brightness rule, and clears the quantity DiAnd adding the black ink to the maximum ink channel according to the proportion of the black ink of the number i ink channel to the black ink of the maximum ink channel. If K ink channels are cleared, clear amount DiEqual values are distributed to C, M, Y channels;
note: and (3) a pixel constant brightness rule, namely calculating the removal amount according to the blackness relation between the maximum ink channel and the removed ink channel, and adding the calculated amount to the ink amount of the maximum ink channel to obtain an actual ink amount D' so as to keep the brightness of the processed pixel unchanged. The algorithm is described as: calculate each in advanceThe maximum blackness value of each ink channel is 100, namely the Lab.L value of the ink of the channel, and the ink quantity D of the ink channel I added on the maximum ink channeli' i ═ i ink channel purge amount × i ink channel blackness/maximum ink channel blackness.
S5 if the ink amount clearing threshold T < XiIf the ink quantity clearing threshold value T + the attenuation radius R is less than the ink quantity clearing threshold value T + the attenuation radius R, performing a mixed algorithm of probability clearing and proportion clearing;
s51 is according to XiAt a position within the decay radius R, the clearance factor P (X) is obtained by the decay functioni)，P(Xi) E (0,1), calculating a first probability value e (0,1) by a probability generator, selecting a threshold PT if the first probability value is less than or equal to a clearing mode, and executing a probability clearing process (clearing a coefficient P (X)i) As a direct erasure probability, a second probability value e [0,1 ] is calculated with a probability generator, if the second probability is less than or equal to P (X)i) The ink amount in channel i will be directly cleared, and the clear amount is Di(ii) a If the second probability value is greater than P (X)i) If so, the ink amount of channel i is not cleared and the clear amount is 0, otherwise, a proportional clear process is performed (clear coefficient P (X)i) As the removal rate, the amount of ink removed in channel i is Di×P(Xi))；
S52, observing the pixel constant brightness rule, distributing the cleaning amount to the maximum ink channel according to the proportion of the black degree of the ink channel I and the black degree of the maximum ink channel, and if the cleaning is the ink channel K, distributing the cleaning amount to the channel C, M, Y in an equivalent manner;
s6 if the pixel has other unprocessed ink channels except the maximum ink channel, turning to the step S3 after the processing pointer points to the next unprocessed ink channel of the pixel, and processing the next unprocessed ink channel of the pixel until all the ink channels of the pixel are processed;
s7 if the multi-ink-channel printer has unprocessed pixels, the process pointer is pointed to next pixel and then the process goes to S2 to process the next pixel until all pixels are processed.
The application has the beneficial effects that: by traversing the image according to pixels, globally analyzing each ink channel with smaller ink volume, selecting a threshold PT parameter by combining an ink volume clearing threshold T, an attenuation radius R and a clearing mode, and selecting an optimal ink volume clearing rule, the influence of the small ink volume channel data on a printing output result is eliminated or reduced as much as possible, and the purposes of enhancing the visual purity of the output result of the multi-ink-channel printer and keeping the transition smoothness of the original gradient image are achieved.
Fig. 1 is a schematic algorithm flow diagram according to an embodiment of the present application.
Example 1 was cleared: the initial pixel data of the CMYKOR ink channels in the multi-color printer device space is (97,1,0,0,0,2), and according to the flow chart of fig. 1, the main flow of the method implemented by the present application is as follows:
(1) according to the image type, defining an ink quantity clearing threshold T, a decay radius R and a clearing mode selection threshold PT, wherein PT is equal to 0,1]: for images with predominant color blocking, R takes small values, e.g. R<T/a，a∈[2,4](ii) a For images that fade into the main, R takes a large value, e.g., R ═ T × b, b ∈ [1,5]]. To make the example more representative, the ink volume removal threshold T was set to 2.2%, and the attenuation radius R was set to 6.6%; the attenuation profile may be approximated by a power-like function (y ═ cx)q+d，q>1,0 < y < 1), etc., and in the above design case, the attenuation function can be defined by y ═ 1- (X)i-T)q/RqAnd 0 < y < 1, the processing pointer points to the initial processing location (i.e., the initial pixel described above, which is the initial processing step for the image, and subsequent pixels are not needed, the same below).
(2) Finding the ink amount Dmax (97) of the largest ink channel (in this case, ink channel No. 1) in the pixel pointed by the processing pointer, and calculating the ink amount ratio X of other ink channelsi: from the ink channel data of the embodiment, it can be seen that the ink amounts of the No. 2 ink channel and the No. 6 ink channel both conform to the small ink amount channel, and the ink amount ratio of the No. 2 ink channel, the No. 6 ink channel and the maximum ink channel ink amount is calculated respectively. Wherein the ink amount of No. 2 ink channel is X 21/97, No. 6 ink channel ink quantity ratio X6Is 2/97.
(3) From the above calculation results, it can be seen that the ink volume ratios of the No. 2 ink channel and the No. 6 ink channel are respectively 1.03% and 2.06% smaller than the ink volume clearing threshold T, and therefore, according to the clearing rule, the following clearing processing is performed:
directly removing the ink quantity of the No. 2 ink channel, wherein the ink quantity of the No. 1 ink channel and the ink quantity of the No. 6 ink channel are directly removed, and the removing quantity is 2;
b. and observing a pixel constant brightness rule, and respectively adding the two clearing amounts to the maximum ink channel according to the blackness of the No. 2 ink channel/the maximum ink channel and the blackness of the No. 6 ink channel/the maximum ink channel.
In this embodiment, the blackness of the 6 ink channels is calculated to be {61, 43, 22, 80, 55, 50}, respectively.
According to the pixel constant brightness rule: ink quantity D of No. 2 ink channel added on maximum ink channel2' clear amount D2X 2 ink channel blackness/maximum ink channel blackness, the amount of ink added to the first ink channel by the ink channel clear amount No. 2 1 is 1 × 43/61 to 0.7 (the accuracy is 1 decimal), the amount of ink added to the ink channel No. 6 by the ink channel clear amount No. 2 is 2 × 50/61 to 1.7, and finally, the actual ink amount D' of the ink channel No. 1 is 97+0.7+1.7 to 99, and the rest is 0.
As shown in fig. 3, after the color of the pixel point is processed by the method, the CMYKOR ink channel data in the device space of the multi-color printer is finally (99,0,0,0,0,0), and after the processing by the method, the device color data of the small ink channel is removed, so that the visual purity of the output result of the multi-color printer is improved.
Clear example 2: the initial pixel data of the CMYKBO ink channels in the multi-color printer device space is (98,50,6,0,2,0), and according to the flow diagram of fig. 1, the main flow of implementing the method in the present application is as follows:
(1) according to the image type, defining an ink quantity clearing threshold T, a decay radius R and a clearing mode selection threshold PT, wherein PT is equal to 0,1]: for images with predominant color blocking, R takes small values, e.g. R<T/a，a∈[2,4](ii) a For images that fade into the main, R takes a large value, e.g., R ═ T × b, b ∈ [1,5]]. To make the examples more representative, the ink volume clearing threshold T was set to 2.2%, the decayThe reduction radius was set to 6.6%. The attenuation profile may be approximated by a power-like function (y ═ cx)q+d，q>1, qt is 2.1), etc., and in this embodiment, the attenuation function may be defined by y ═ 1- (X)i-2.2)2.1/6.62.1And y is more than 0 and less than 1, and the processing pointer points to the initial processing position.
(2) Finding out the ink amount Dmax (98) of the maximum ink channel (in this case, ink channel No. 1) in the pixel pointed by the processing pointer, and calculating the ink amount ratio X of the other ink channelsi: from the ink channel data of the embodiment, it can be seen that the ink amounts of the No. 3 ink channel and the No. 5 ink channel both conform to the small ink amount channel, and the ink amount ratio of the No. 3 ink channel, the No. 5 ink channel and the maximum ink amount channel (the No. 1 ink channel) is calculated respectively. Wherein the ink amount of No. 3 ink channel is X 36/98, No. 5 ink channel ink quantity ratio X5Is 2/98.
(3) From the above calculation results, it can be seen that the ink amount occupying ratio of the No. 5 ink channel is 2.04% smaller than the ink amount clear threshold T, and direct clear is adopted.
The ink amount directly removed by the a.5 ink channel is 2;
b. according to the pixel constant brightness rule, the amount of ink channel No. 5 erased 2 added to ink channel No. 1 is 2 × 55/61 — 1.8.
(4) Ink quantity ratio X of No. 3 ink channel36.12% is greater than the ink amount removal threshold T2.2%, and is less than the sum of the ink amount removal threshold T and the attenuation radius R by 8.8%, and the following removal processing is performed in combination with two removal rules of probability removal and proportion removal:
a. ink amount ratio X according to No. 3 ink channel3Applying the decay function to obtain the clearing coefficient P (X) of the No. 3 ink channel in the decay radius R (6.12% of the position in the decay radius R)3) 0.33 (two decimal places);
b. and obtaining a first probability value through a random number Rand (0,1), if the first probability value is not more than the clearing mode selection threshold value PT, executing a probability clearing process, and otherwise, executing a proportion clearing process (the probability of 1-PT). In this example, the threshold PT for the cleaning mode selection is 0.3, that is, the probability that the small ink amount of the ink channel No. 3 is 30% is executed to perform the probability cleaning process, and the probability of 70% is executed to perform the proportion cleaning process;
c. when the probability clearing process is executed, the coefficient P (X) is cleared3) Is the direct probability of erasure for the probabilistic erasure procedure. Obtaining a second probability value through a random number Rand (0,1), and if the second probability value is less than or equal to a clearance coefficient P (X)3) Then the 3 rd ink channel small ink amount (with 33% probability) is directly cleared, and the clearing amount D is 6; if the second probability value > the removal factor P (X)3) If so, the 3 rd ink channel (with 67% probability) is not cleared, and the clear amount D is 0;
according to the pixel constant brightness rule, the amount added to the ink channel No. 1 when the probability clearing process is actually performed and is directly cleared is 6 × 22/61 — 2.16;
d. there is a 70% probability that the proportional cleaning process is performed, and the proportional cleaning amount of the ink channel No. 3 is D3×P(X3) When proportional cleaning occurs, the amount of cleaning 2 for ink channel No. 3 added to ink channel No. 1 is 2 × 22/61, which is 0.72, according to the pixel brightness rule ≈ 6 × 0.33 ≈ 2.
e. The random number may be linear congruence (li)near consequential method) pseudo random number algorithm implementation. It uses a recursive formula: randn+1＝(A×Randn+ B)% M. In this example, the multiplier a is 1140671485, the increment B is 12820163, and the modulus M is 32767.
As shown in fig. 4, after the color is processed by the method of the present application, the pixel (98,50,6,0,2,0) is directly cleared with a probability of 0.3 × 0.33, and the result is (100,50,0,0,0, 0); there is a probability of 0.3 × 0.67 not being cleared, resulting in (98,50,6,0,0, 0); there is a probability of 0.7, and a proportional cleaning of the ratio 0.33 results in (99,50,4,0,0, 0). The data shows that after the processing of the method, the color data of the equipment in the small ink amount channel is eliminated or reduced, the visual purity of the output result of the printer with various colors is improved, and the gradual transition fluency of the original image can be well maintained.
The clear amount of the K ink channel is distributed to C, M, Y channels and is calculated by adopting a gray Component replacement rule, namely GCR (Gray Component replacement), the principle is that a gray and black part formed by C, M, Y in an image can be reproduced by equal value K ink, and conversely, the K ink can be replaced by the gray and black generated by equal value C, M, Y so as to achieve consistency of optical and visual effects. The addition of the K ink purge amount equivalent to the C, M, Y channel according to the Gray Component Replacement (GCR) rule is exemplified as follows:
such as CMYK (0,0,0, 5); k ink is cleared and becomes CMYK (5,5,5, 0).
The embodiments of the present application are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present application should be construed as equivalents and are included in the scope of the present application.
Claims (5)
1. A color purity enhancement method of output data of a multi-ink-channel printer, wherein the color space of the multi-ink-channel printer comprises CMYK, is characterized by comprising the following steps:
s1 defines a multi-ink channel printer ink quantity clearing threshold T, an attenuation radius R, a clearing mode selection threshold PT and an attenuation function, and a processing pointer points to an initial processing position of an image to be printed and output;
s2 finding the maximum ink channel and ink amount in the pixel;
s3 calculating the ratio X of ink amount in other ink channels in the pixeliWherein the subscript i refers to the number of ink channels in the pixel, X, other than the largest ink channeliThe ink amount D of the i ink channel in the pixeliThe ratio of the ink volume to the maximum ink channel in the pixel;
s4 if XiNot greater than the ink amount clear threshold:
s41 directly clearing the ink amount of the i ink channel in the pixel;
s42, adding the cleaning amount to the maximum ink channel according to the ratio of the blackness of the i-number ink channel to the blackness of the maximum ink channel, and if the cleaning is performed by the K-number ink channel, equally distributing the cleaning amount to the C, M, Y channel;
s5 if the ink amount clear threshold is < XiIf the ink amount is less than the threshold value for removing ink and the radius of attenuation, the probability removal and the proportional removal are performedRemoving the mixture;
s51 is according to XiAt a position within the attenuation radius, the clearance factor P (X) is obtained by the attenuation functioni），P（Xi) E (0,1), calculating a first probability value e (0,1) by using a probability generator, if the first probability value is less than or equal to a clearing mode selection threshold value, executing a probability clearing process, or else executing a proportion clearing process;
the probability clearing process comprises the following steps: removing coefficient P (X)i) As a direct erasure probability, a second probability value e [0,1 ] is calculated by a probability generator, if the second probability value is less than or equal to P (X)i) The ink amount of the channel i is completely removed; if the second probability value is greater than P (X)i) If the ink quantity of the channel I is not cleared, the ink quantity of the channel I is not cleared;
the proportional cleaning process comprises the following steps: removing coefficient P (X)i) As the removal rate, the amount of ink removed in channel i is Di×P（Xi）；
S52, the clearing quantity is distributed and added to the maximum ink channel according to the proportion of the black degree of the ink channel I to the black degree of the maximum ink channel, if the ink channel is cleared by the ink channel K, the clearing quantity is distributed to the channel C, M, Y in an equivalent way;
s6 if the pixel has other unprocessed ink channels except the maximum ink channel, turning to the step S3 after the processing pointer points to the next unprocessed ink channel of the pixel, and processing the next unprocessed ink channel of the pixel until all the ink channels of the pixel are processed;
s7 if the multi-ink-channel printer has unprocessed pixels, the process pointer is pointed to next pixel and then the process goes to S2 to process the next pixel until all pixels are processed.
2. The method of enhancing color purity of output data from a multi-ink-channel printer of claim 1, wherein:
0 < clear mode selection threshold < 1, decay function y = cxq+d，q>1，0＜y＜1。
3. The method of enhancing color purity of output data from a multi-ink-channel printer as claimed in claim 1 or 2, wherein: for a predominantly color-block image, R < T/a, a ∈ [2,4 ].
4. The method of enhancing color purity of output data from a multi-ink-channel printer as claimed in claim 1 or 2, wherein: for images that fade into the main, R = T × b, b ∈ [1,5 ].
5. The method of enhancing color purity of output data from a multi-ink-channel printer of claim 2, wherein: the ink amount removal threshold T is 2.2%, the attenuation radius R is 6.6%, the removal mode selection threshold is 0.3, and the attenuation function is y =1- (X)i-2.2)2.1/6.62.1。
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